H-Bridge to drive white LED arrays directly from the AC mains supply
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The classical H-bridge circuit is widely popular in driving DC motors in robotics applications. This article talks about a novel application of the H-bridge circuit for driving white-LED arrays directly from the AC mains in full-wave current-limited mode to realize an excellent flicker-free, energy-efficient solid-state lamp. The circuit controls and maintains the LED excitation current in both negative and positive half cycles of the excitation voltage to a constant level by way of electronic switches operating alternately during the positive and negative excursion of the excitation voltage.
H-bridge circuit for driving white LED arrays
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